>> reporter: perry's exit from the race and his endorsement came just minutes after abc news released an interview with gingrich's second ex-wife, marianne. she says gingrich asked her if they could have an open marriage so he could carry on an affair with his current wife calista. >> you said? >> no. no. that is not a marriage. >> reporter: on the campaign trail today, he refused to comment on his ex-wife but brought his grandson on stage and played up his family ties. >> both of my daughters are prepared to speak on the record with any of you who would like to talk to them. several other people who knew the situation are prepared to speak on the record. i'm not getting involved. >> reporter: it's now a fight between newt gingrich and rick santorum for south carolina's social conservative voters. santorum was here in mount pleasant rallying supporters, who say they like his chances in saturday's primary. >> if they look at the issues and decide for themselves, i would think more people would choose rick santorum than anyone else. >> reporter: today santorum got word that he actually